I have changed air filter. I have check everything that the manual says to do. I made up fresh oil and gas mix. My mantis died. it will not crank up.
On page 17 under "MAINTENANCE" I have done all these things, with the acception of not changing the fuel filter. I don't have one. I have used my tiller for 2 seasons. Could this be the problem? How can I check this out and/or get a new filter?
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Having owned a Mantis for many years it sounds like your air/fuel mixture may be to lean when you push the choke in. First check the simple stuff. Make sure you are using fresh fuel with the proper 2-cycle oil mixture. Check or replace the fuel and air filters. Replace the spark plug annually. These are the routine maintenance procedures found in your owner's manual. If none of this solves your problem either the carb fuel mix adjustment screws are not set properly or a carb rebuild kit is needed. The proper setting for the mixture screws should be detailed in your manual. Removing the carb and replacing the needle valves, gasket and other items takes a little more expertise. Before jumping in to this and assuming all other maintenance has been performed press the fuel primer bulb several times before trying to start it. You should feel resistance after 3-4 pushes. If you don't feel any resistnace the carb is not being primed and the bulb needs replacement (you may notice a small fuel leak if this is the case). If you can get it primed, pull the choke out, start and let it run a minute or so. Then make small, gradual changes by turning the fuel mix screws (not the idle adjustment) as noted in your manual. Try to push the choke in half way or as far as you can without killing the engine. If may run a little rough but continue tweaking the screws until it smooths out a little. Gradually continue pushing the choke in and turning the adjustment screws as needed to keep it from stalling. This is best done with the tines supported off the ground during adjustments. Just make sure to protect yourself and others from coming in to contact with them. When set correctly you should be able to achieve full throttle with the choke fully closed. A little time and patience should get you up and going again. Of course you can always contanct Mantis at www.mantis.com or call them for troubleshooting assistance. Hope this helps.
You should be able to go to the Mantis web site and download the owners manual. To start, make sure the switch in turned on, push the fuel primer bulb several times (until you feel resistance), pull the choke out all the way and pull the starter rope until it fires. Then, push the choke half way in and it should start. Let it run a 30 seconds to 1 minute and then push the choke all the way in. Be sure you are using the currect fuel/oil mixture with fresh gas and oil. If you have not done so already clean the air filter and replace the spark plug at the recommended interval.
First check that your Mantis needs an oil/gas mixture, most of the newer Mantis tillers have four-stroke motors meaning they have oil in the crankcase and use straight gas. If your Mantis needs oil mixed in the gas use a 50:1 ratio. That's usually 2.6 ounces of two-cycle oil (it's sold in bottles that size) to one gallon of gas but read the oil bottle to get the proper mix ratio.
you probably have gum or varnish built up inside the carb. take it apart and clean all the ports and jets with fresh gas. drain the float bowl and fill it with fresh gas as well. if you are not familiar with carbs, best not take it apart yourself, or pay VERY close attention to how it came apart.
Hi Don. There are two adjustment screws on the carburetor. Start the engine and while it is idling, turn the screw closest the engine (low speed adjustment) counterclockwise until it starts to falter, then back a 'hair' and try the throttle again. If that doesn't work, I would recommend doing what I usually do... put a new carb on and be done with it! Carb is a Zama C1U-K54A
Back pressure. You will need to tear into the mantis and replace all the gaskets. You can do it the cheaper way by going to Kragen and just buy a tube of gasket sealent, or you can go to mantis and order the rebuild kit. I recommend the gasket sealent for me that has always worked better
jj505 has good and bad information. Honda GX25 is a 4 stroke motor, with oil lubricated crankcase. Oil drains out the filler. Oil and gas do not mix on this four stroke. The PDF below is the Honda manual. http://www.smallenginewarehouse.com/images/manuals/GX25-35.pdf
Your quickest fix for this problem is to simply replace the carburetor, a Zama K54A. Do it all the time. After that, if you can find a 2 cycle oil, Opti-2, it's the best you can use and it's a one mix for all your 2 cycle equipment (blowers, trimmers, chainsaws, etc.) It's the only 2 cycle I sell in my shop.